US6575637B1ExpiredUtility

Brake rotor and wheel bearing assembly

Assignee: NTN TOYO BEARING CO LTDPriority: Sep 10, 1999Filed: Sep 7, 2000Granted: Jun 10, 2003

Est. expirySep 10, 2019(expired)· nominal 20-yr term from priority

Inventors:Eiji Tajima Shigeaki Fukushima Akira Torii Kazuhiro Azuma Naoshi Kinpara Hisashi Ohtsuki Kazunari Yamamoto Motoharu Niki Masuo Takaki

F16C 2326/02F16D 2065/1308B60B 27/0084B60T 1/065F16C 19/184B60B 27/00F16D 2065/1384F16D 65/12Y10T29/49682Y10T29/49492Y10T29/49536

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Claims

Abstract

A reliable brake rotor and wheel bearing assembly are proposed which make unnecessary adjustment of runout of brake rotor at the customer's factory. For runout of each of the mounting surface and back of the brake rotor itself, and runout of the side of the wheel mounting flange of the inner member to which is mounted the brake rotor, the maximum difference between the peaks of crests and troughs in each period of surface runout is restricted within a standard value, and the brake rotor is mounted to the wheel mounting flange, thereby eliminating the necessity of mounting of the brake rotor and adjustment of runout after mounting at the customer's factory to provide a reliable automotive wheel bearing assembly.

Claims

exact text as granted — not AI-modified

What is claimed is:

1. A wheel supporting assembly operable to support a wheel on a vehicle body, said wheel supporting assembly comprising:
a wheel bearing assembly comprising a rotary member and rolling elements disposed in two rows for rotatably supporting the wheel; and
a brake rotor having a mounting surface and being mounted to said rotary member such that said mounting surface abuts said rotary member,
wherein said mounting surface has a maximum runout variation equal to or less than 50 μm.

2. The wheel supporting assembly of claim 1 , wherein said brake rotor has a second surface on a side opposite of said mounting surface, and
wherein said second surface has a maximum runout variation equal to or less than 50 μm.

3. The wheel supporting assembly of claim 1 , wherein the maximum runout variation per cycle of said mounting surface is less than or equal to a first value.

4. The wheel supporting assembly of claim 3 , wherein said brake rotor has a second surface on a side opposite of said mounting surface, and
wherein said second surface has a maximum runout variation equal to or less than 50 μm.

5. The wheel supporting assembly of claim 3 , wherein said mounting surface has a maximum runout variation equal to 30 μm.

6. The wheel supporting assembly of claim 1 , wherein at least one of the maximum difference between the peak values of crests and the maximum difference between the peak values of troughs in each cycle of runout of said mounting surface is less than or equal to a first value.

7. The wheel supporting assembly of claim 6 , wherein said brake rotor has a second surface on a side opposite of said mounting surface, and
wherein at least one of the maximum difference between the peak values of crests and the maximum difference between the peak values of troughs in each cycle of runout of said second surface is less than or equal to a second value.

8. The wheel supporting assembly of claim 6 , wherein the maximum runout variation and the first value are each equal to 30 μm.

9. The wheel supporting assembly of claim 1 , further comprising:
a number of wheel mounting bolts,
wherein the frequency of runout of said mounting surface per rotation of said mounting surface is an integer multiple of the number of wheel mounting bolts.

10. The wheel supporting assembly of claim 1 , further comprising:
a number of wheel mounting bolts,
wherein the number of wheel mounting bolts is an integer multiple of the frequency of runout of said mounting surface per rotation of said mounting surface.

11. An assembly comprising:
a wheel bearing assembly operable to rotatably support a wheel, said wheel bearing assembly comprising an outer member, an inner member, a wheel mounting flange and two rows of rolling elements, said outer member having an inner surface having two raceways thereon, said inner member having an outer surface having two raceways thereon, said inner member being disposed such that said two raceways on said outer surface oppose said two raceways on said inner surface, said two rows of rolling elements being mounted between said opposed raceways, said wheel mounting flange being formed on one of said outer member and said inner member, said wheel mounting flange having a mounting side; and
a brake rotor comprising a mounting surface that has a maximum runout variation equal to or less than 50 μm, said brake rotor being mounted onto said mounting side of said wheel mounting flange.

12. The assembly of claim 11 , wherein the maximum runout variation per cycle of said mounting surface is less than or equal to a first value.

13. The assembly of claim 12 , wherein the maximum runout variation per cycle of said mounting surface is equal to 30 μm.

14. The assembly of claim 11 , wherein one of the maximum difference between the peak values of crests and the maximum difference between the peak values of troughs in each cycle of runout of said mounting surface is less than or equal to a first value.

15. The assembly of claim 14 , wherein the first value is equal to 30 μm.

16. The assembly of claim 11 , further comprising:
a number of wheel mounting bolts,
wherein a frequency of runout of said mounting surface per rotation of said mounting surface is an integer multiple of the number of wheel mounting bolts.

17. The assembly of claim 11 , further comprising:
a number of wheel mounting bolts,
wherein the number of wheel mounting bolts is an integer multiple of a frequency of the runout of said mounting surface per rotation of said mounting surface.

18. The assembly of claim 11 , wherein said wheel mounting flange and said inner member are unitarily formed.

19. The assembly of claim 11 , wherein said brake rotor further comprises a brake surface that has a maximum runout variation that is less than or equal to a first value.

20. The assembly of claim 19 , wherein the first value is 100 μm.

21. The assembly of claim 20 , wherein the maximum runout variation of said brake surface is 50 μm.

22. The assembly of claim 11 , further comprising a drive shaft mounted in said inner member.

23. The assembly of claim 11 , further comprising:
a raceway member fixed to said inner member,
wherein one of said two raceways on said inner member is formed directly on said inner member, and
wherein the other of said two raceways on said inner member is formed on said raceway member.

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